Add dependencies to spec.
Check dependency format on unmarshal.
Store dependencies in a map.
Add Nut.Prefix().
Refactor dependency parsing.
Parse >= in dependency.
Merge dependencies.
Fix nut dependency regexp.
Tweaks for VCS.
Some dependency helpers.
Add Dependencies.String()
Split files.
Fix JSON marshaling of empty dependencies.
Tweak tests.
Stringer for object, not pointer.
Initial bundle code.